The All-Day Energy Guide

Bust a Move!

The right exercise stimulates your metabolism -- and the more active yours is, the more bright-eyed and bushy-tailed you'll feel. "Muscle is the most metabolically active tissue in the body. Research shows that about 30 minutes of interval strength training keeps your metabolism raised for up to 38 hours after you've worked out," says Jim Karas, weight-loss expert and author of The 7-Day Energy Surge. Why churn away on the elliptical machine for 45 minutes? Use this circuit to get stoked.

• Do 10 push-ups (count "one one-thousand, two one-thousand," etc., as you press down and up).
• Using heavy weights (12 to 15 pounds), hold dumbbells at your sides and perform 10 forward lunges and 10 backward lunges.
• Starting on elbows, hold the plank position for 1 minute. Straighten arms into full push-up position; hold 1 minute. Lift right leg 6 inches off floor for 30 seconds. Repeat with left leg. Rest 30 seconds.
• Repeat the circuit 3 times.

Bonus Tip: The Other A.M. Secret
If you really want to top out on energy, have sex. It releases the stimulatory brain chemicals dopamine and PEA (short for phenylethylamine), which make you feel alert and playful.